This is a note to let you know that I've just added the patch titled
usbip: vudc_tx: fix v_send_ret_submit() vulnerability to null xfer buffer
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usbip-vudc_tx-fix-v_send_ret_submit-vulnerability-to-null-xfer-buffer.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5fd77a3a0e408c23ab4002a57db980e46bc16e72 Mon Sep 17 00:00:00 2001
From: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Date: Fri, 22 Dec 2017 19:23:47 -0700
Subject: usbip: vudc_tx: fix v_send_ret_submit() vulnerability to null xfer buffer
From: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
commit 5fd77a3a0e408c23ab4002a57db980e46bc16e72 upstream.
v_send_ret_submit() handles urb with a null transfer_buffer, when it
replays a packet with potential malicious data that could contain a
null buffer.
Add a check for the condition when actual_length > 0 and transfer_buffer
is null.
Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/usbip/vudc_tx.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/usb/usbip/vudc_tx.c
+++ b/drivers/usb/usbip/vudc_tx.c
@@ -97,6 +97,13 @@ static int v_send_ret_submit(struct vudc
memset(&pdu_header, 0, sizeof(pdu_header));
memset(&msg, 0, sizeof(msg));
+ if (urb->actual_length > 0 && !urb->transfer_buffer) {
+ dev_err(&udc->gadget.dev,
+ "urb: actual_length %d transfer_buffer null\n",
+ urb->actual_length);
+ return -1;
+ }
+
if (urb_p->type == USB_ENDPOINT_XFER_ISOC)
iovnum = 2 + urb->number_of_packets;
else
@@ -112,8 +119,8 @@ static int v_send_ret_submit(struct vudc
/* 1. setup usbip_header */
setup_ret_submit_pdu(&pdu_header, urb_p);
- usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n",
- pdu_header.base.seqnum, urb);
+ usbip_dbg_stub_tx("setup txdata seqnum: %d\n",
+ pdu_header.base.seqnum);
usbip_header_correct_endian(&pdu_header, 1);
iov[iovnum].iov_base = &pdu_header;
Patches currently in stable-queue which might be from shuahkh@xxxxxxxxxxxxxxx are
queue-4.9/usbip-fix-vudc_rx-harden-cmd_submit-path-to-handle-malicious-input.patch
queue-4.9/usbip-remove-kernel-addresses-from-usb-device-and-urb-debug-msgs.patch
queue-4.9/usbip-vudc_tx-fix-v_send_ret_submit-vulnerability-to-null-xfer-buffer.patch